8. NTSC CHROMA ADJUSTMET
No.Adjustment pointAdjustment procedure/conditionsWaveform and others
1SUB-TINT1) Receive the "NTSC3.58 Colour Bar" signal thru
(I2C BUS CONTROL)AV in.
2) Connect the oscilloscope to B-Amp Transistor
Base (TP853 ).
Range: 100mV/Div. (AC)(Use Probe 10:1)
Sweep time : 10 ?sec/Div.
3) In Service mode, go to V07, press R/C Y-
mute(Hex E4) or FLASHBACK Key.
4) Call the "V07" data in service mode. Adjust theWYCy G Mg R B
"V07" bus data to obtain the waveform shown as
Fig. 1-1.Fig. 1-1
5) Disable Y-Mute by pressing key(Hex E4) or
FLASHBACK, then clear the SERVICE mode.
9. SECAM CHROMA ADJUSTMENT
No.Adjustment pointAdjustment procedure/conditionsWaveform and others
1SECAM1) Receive ?SECAM COLOUR BAR? signal.
BLACK LEVEL2) In the service mode, select service data V14.Offset
R-Y/B-Y3) Connect oscilloscope to TP 801.
2
(IC BUSRange: 20mV/Div. (AC)(Use Probe 10:1)
CONTROL)Sweep time : 20 ?sec/Div.
4) Adjust the V14 so that the offset of R-Y is mini-
Fig 2-1(a)
mum, shown in Fig 2-1(b), it means adjust the
offset of between No signal line and Signal line to
minimum.
5) In the service mode, select service data V15.
6) Connect oscilloscope to TP 801.
Range: 20mV/Div. (AC)(Use Probe 10:1)
Sweep time : 20 ?sec/Div.
7) Adjust the V15 so that the offset of B-Y to mini-
Fig 2-1(b)
mum, shown in Fig 2-2(b), it means adjust the
offset of between No signal line and Signal line to
minimum.
Offset
Fig 2-2(a)
Fig 2-2(b)
3 - 21 |
ACEC
